array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'es', ), 'this' => array ( 0 => 'appenditerator.key.php', 1 => 'AppendIterator::key', ), 'up' => array ( 0 => 'class.appenditerator.php', 1 => 'AppendIterator', ), 'prev' => array ( 0 => 'appenditerator.getiteratorindex.php', 1 => 'AppendIterator::getIteratorIndex', ), 'next' => array ( 0 => 'appenditerator.next.php', 1 => 'AppendIterator::next', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'es', 'path' => 'reference/spl/appenditerator/key.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 5 >= 5.1.0, PHP 7, PHP 8)
AppendIterator::key — Obtiene la clave actual
Obtener la clave actual.
Esta función no tiene parámetros.
La clave actual si es válida o null
en caso contrario.
Ejemplo #1 Ejemplo básico de AppendIterator::key()
<?php
$array_a = new ArrayIterator(array('a' => 'aardwolf', 'b' => 'bear', 'c' => 'capybara'));
$array_b = new ArrayIterator(array('apple', 'orange', 'lemon'));
$iterator = new AppendIterator;
$iterator->append($array_a);
$iterator->append($array_b);
// Manual iteration
$iterator->rewind();
while ($iterator->valid()) {
echo $iterator->key() . ' ' . $iterator->current() . PHP_EOL;
$iterator->next();
}
echo PHP_EOL;
// With foreach
foreach ($iterator as $key => $current) {
echo $key . ' ' . $current . PHP_EOL;
}
?>
El resultado del ejemplo sería:
a aardwolf b bear c capybara 0 apple 1 orange 2 lemon a aardwolf b bear c capybara 0 apple 1 orange 2 lemon